What are the best romantic ways to propose "Will You Marry Me"?

This is it. I have found my princess. She is the one and only one. I would like to ask her to marry me. Now the problem is how to ask her the most important question of your life.

How did you asked your loved one to marry you?
How can I make it special to be remembered?
Should I ask her hands from her parents first?
Should I talk with someone before and let them know what is going to happen?
Does the day and time important?
I must buy a ring first?
After asking, who should I call first? second? third?

Please advice. I want it to be one of the happiest day of our life.
As usuall, thank you for your time to answer. Go Fluther!